1/8" DIAMOND DRILL BIT

Diamond Core Drill Bits are premium specialty drill bits designedfor drilling in hard abrasive non-ferrous materials.
The electroplate bonded diamond drill bits have a superior designdeveloped through extensive testing.

Material uses include:

Glass
Ceramics
Tile
Stone
Window Glass
Glass Block
Stained Glass
Aquarium Glass
Glass Fixtures
Ceramics
China Plates
Porcelain Dishes
Ceramic Fixtures
Porcelain Fixtures
Wall Tile
Floor Tile
Stone Tile
Ceramic Tile
Porcelain Tile
Slate
Marble
Quartz
Granite
Limestone

Designed for drilling to depths of about 1/2"
(Not for use on metals,concrete, masonry, or with impact hammer drills)

Electroplate Bonded Diamond Core Drill Bits are designed fordrilling in most types of hard abrasive non-ferrous materials. Many special design features have been engineered into the DiamondSurebits to provide optimum drilling efficiency in extremely hard,unforgiving materials such as stone, tile and glass.

Shaft Lubrication Hole: Allows bit to be used with a "center water-feed" lubrication system to provide maximum tip lubrication. Also provides a secondary accesspoint for removal of drill cores. The use of a center water-feedsystem is optional.

Common Shaft Sizes: Shafts are 3/8"or less to fit any standard drill.

Core Extraction Holes: Special holes in backof the "Bell" allow easy removal of cores or plugs.

Nickel Plated: Reduces bit friction and heat build-upand inhibits rust.

Tip Lubrication Holes: Provides optimum tip lubrication by allowing water flow in and out of bit.

Grooved Tip Edge: Provides maximum surface area for diamondbonding and increases water "churn" to optimize tip lubrication.

Bonded Diamond Grit: Electroplate bonded diamonds for optimum diamond life.

Exclusion of Pilot Bits on Diamond Core Drill Bits

Pilot bits are often used on standard metal core drill bits and hole saws designed for use on wood, plastic and other relatively soft materials. As shown in the picture, a pilot bit is a small drill bit located in the center of the hollow core drill bit. The pilot bit helps keep the main core drill bit centered while starting a hole. Pilot bits are especially convenient when using a core drillbit in a hand drill. When a pilot bit is not present, a core drill bit may tend to "walk" or "wander"until the bit seats into a groove.

However, pilot bits are rarely used on diamond core drill bits since there are many engineeringdrawbacks of using a pilot bit when drilling in very hard materials with a diamond core drill bit.

The diamond pilot bit usually wears out before the main core bit.

Drilling times can be considerable when drilling in very hard materials and a pilot bit can doublethe drilling time since two holes are being drilled.

A pilot bit eliminates the shaft water-feed lubrication hole and does not allow the use of centerwater-feed equipment.

A diamond pilot bit adds significant cost to an already expensive diamond drill bit.

A template can easily be used to start a core drill that does not have a pilot bit. This simple technique is discussed in the following section.


Starting a CoreDrill Bit by Using a Template

Core drill bits above 1/2"work best when used in a drill press rather than in a hand drill. Starting a core drill bit when using a drill press is simple,since the drill press keeps the drill bit from moving about. To reduce drill bit slippage or "walking" when usinga hand drill, a template can be made to help start the drillbit if necessary.

A template is made by drillinga pilot hole in a piece of soft wood or plastic, using the diamondcore drill bit or by cutting a "V" in the edge of apiece of wood or plastic or drilling a hole in it the size ofther core drill. The hole template works best, however,the "V" template is easier to make and can be usedwith many sizes of core drill bits.

Templates are often made of 1/8"plexiglass, 1/8" pressed wood or even cardboard. Forrepetitive drilling, a plastic or plexiglass template works bestsince water lubrication can be used immediately. The templateis placed on the surface of the material being drilled, withthe pilot hole or "V" above the target hole area. The template will hold the core drill bit in place as it starts. After just a few revolutions of the drill bit, a groove is createdand the template can be removed.